Electromagnetic relay

Abstract

An electromagnetic relay includes an electromagnetic unit, a magnetic unit, first and second contacts, and a movable conductive terminal. The magnetic unit has a magnetic member having a fulcrum portion, a magnetic driven subunit, an arcuate groove, and an arcuate protrusion. The magnetic driven subunit includes a pushing block for pushing the movable conductive terminal, and a magnetic component magnetically attractable by the electromagnetic unit. The arcuate groove and the arcuate protrusion are respectively and interchangeably formed in the fulcrum portion and the magnetic component, and are pivotably connected to each other such that the magnetic component is pivotable about the fulcrum portion relative to the magnetic member. The movable conductive terminal is driven by the electromagnetic unit to contact one of the first contact and the second contact.

What is claimed is: 
     
         1 . An electromagnetic relay comprising:
 a base unit;   an electromagnetic unit disposed on said base unit and operable for generating an electromagnetic force when being energized;   a magnetic unit mounted to said electromagnetic unit and having
 a magnetic member that is connected fixedly to said electromagnetic unit and that has a fulcrum portion, 
 a magnetic driven subunit that includes a pushing block and a magnetic component having:
 a magnetic driven portion that is supported on said fulcrum portion and that is magnetically attractable by said electromagnetic unit; and 
 a levered portion that extends substantially transversely from one side of said magnetic driven portion and that is connected to said pushing block, 
 
 an arcuate groove that is formed in one of said fulcrum portion and said magnetic driven portion, and 
 an arcuate protrusion that is formed at another one of said fulcrum portion and said magnetic driven portion, that is pivotably connected to said arcuate groove such that said magnetic component is pivotable about said fulcrum portion relative to said magnetic member; 
   a first conductive terminal disposed on said base unit and including a first contact;   a second conductive terminal disposed on said base unit and including a second contact that is opposite to and spaced apart from said first contact; and   a movable conductive terminal including
 a movable conductive connector that is disposed on said base unit, that is disposed between said first contact and said second contact, and that is pushed by said pushing block of said magnetic driven subunit when said electromagnetic unit is energized, and 
 a movable contact that is disposed on said movable conductive connector, 
   wherein, when said electromagnetic unit is energized, said magnetic component is magnetically attracted and driven by the electromagnetic force of said electromagnetic unit to move, such that said levered portion of said magnetic component drives said pushing block to push said movable conductive connector and that said movable contact contacts one of said first contact and said second contact, and when said electromagnetic unit is powered off, said magnetic component is not magnetically attracted by said electromagnetic unit, such that said movable contact contacts another one of said first contact and said second contact.   
     
     
         2 . The electromagnetic relay as claimed in  claim 1 , wherein:
 said fulcrum portion of said magnetic member extends in a first direction;   said magnetic driven portion of said magnetic component extends in a second direction transverse to the first direction;   said levered portion extends transversely from said one side of said magnetic driven portion; and   said magnetic component further has a bent portion connected between said magnetic driven portion and said levered portion, and spaced apart from said magnetic member in the second direction.   
     
     
         3 . The electromagnetic relay as claimed in  claim 1 , wherein:
 said fulcrum portion of said magnetic member extends in a first direction;   said magnetic driven portion of said magnetic component extends in a second direction transverse to the first direction;   said levered portion extends transversely from said one side of said magnetic driven portion;   said magnetic component further has two positioning portions respectively provided on two sides of said magnetic driven portion that are opposite in a third direction transverse to the first direction and the second direction; and   said base unit has two engaging portions spaced apart from each other in the third direction and respectively positioning said positioning portions.   
     
     
         4 . The electromagnetic relay as claimed in  claim 3 , wherein:
 said positioning portions of said magnetic component extend away from each other and extend respectively from two sides of said magnetic driven portion that are opposite in the third direction; and   said engaging portions of said base unit extend toward each other along the third direction and respectively press against said positioning portions.   
     
     
         5 . The electromagnetic relay as claimed in  claim 1 , wherein said movable conductive connector includes:
 a conductive plate disposed on said base unit; and   a swing sheet movably connected to said conductive plate, provided for said movable contact to be disposed thereon, and pushed by said pushing block when said electromagnetic unit is energized.   
     
     
         6 . The electromagnetic relay as claimed in  claim 1 , wherein said movable conductive connector has:
 a fixed portion positioned on said base unit;   a swinging portion extending in a first direction, disposed between said first conductive terminal and said second conductive terminal in a second direction that is transverse to the first direction, and provided for said movable contact to be disposed thereon; and   a resilient tab portion disposed between said fixed portion and said movable contact in the second direction, extending from said swinging portion inclinedly toward said magnetic driven subunit and said movable contact, and configured to store a restoring force when being pushed by said pushing block, and the restoring force is for biasing said movable contact to contact said another one of said first contact and said second contact when said electromagnetic unit is powered off.